There is a thread that is for picking 10 must-sees in every park, but before that thread I didn't know that DAK and MGM had 10 attraction each(jk). So I decided to start a thread for the top 10 throughout the 4 WDW parks.
Here's my list starting with the best and descending down. I have yet to ride Everest so I will reserve judgement.
1. The Haunted Mansion
2. The Twilight Zone Tower of Terror
3. Splash Mountain
4. Big Thunder Mountain Railroad
5. Pirates of the Carribean (enough though it sucks compared to DL's.)
6. Dinosaur (even though it pales in comparasion to DL's Indiana Jones Adventure.)
7. Space Mountain
8. Spaceship Earth
10. Peter Pan's Flight
If Mr. Toad were still around it would probably be at or above #5.